Bumping-screen.



No. 762,239. PATLNILD JUNE 7,1904.

II. L. KING.

BUMPING SCREEN.

APPLICATION FILED SEPT. 1, 190s.

NO MODEL.

/NVENTQH 47W WMM-Yi? A TTOHNEYS- fff 'UNITED STATES Patented June '7, 1904.

HARRY LEALAND KING, OF DENVER, COLORADO.

BUNIPINGFSCRIEEN.

SPECIFICATION forming' part of Letters Patent No. 762,239, dated June '7, 1904.

Application iled September l, 1903. Serial No. 171,474. (No model.)

To all 'whom #may con/cern,.-

Be it known that I, HARRY LEALAND KING, a citizen of the United States, residing at.Den ver, in the county of Denver and State of Colorado,have invented anew and useful Improvement in Bumping-Screens, of which the following is a specification.V

My invention is in the nature of certain improvements upon the bumping-screen for assorting ores which was patented by me August 4, 1903, No. 735,525,

It consists in the construction and arrangement of the tappet mechanism for vibrating the screen-frame and in the combination of the same with the screen and its accessory parts, as will be hereinafter fully described with reference to the drawings, in which;

Figure 1 is a vertical longitudinal section; Fig. 2, a plan View, partly broken away, of the lower end of the screen; Fig. 3, a vertical transverse section on line 3 3 oi' Fig. 1; and Figs. 4 and 5 are enlarged details in side and front view of the tappeti-Wheel, showing in section also in Fig. 4 a portion oi' the vibrating screen-frame and its wear-plate.

In the drawings, 1 2 3 4 represent the several members of the stationary frame, in which is mounted on flexible supports 10 and 11 the screen, composed of side .frames 7 a, reticulated screen fabric 8, and side pieces 9.

VA shaft 18, operated by a'tight-and-loose band-pulley, gives vibratory motion to the screen on its iieXible supports 10 and 11, aided by the buffer-spring 14.

The mechanism for vibrating the screen in my former patent consisted of a wiper-cam.

The present means for vibrating the screen consist of a tappet-wheel of special construction and its relation to the reinforced wearsurface of the screen, against which itl acts. (This is best shown in Figs. 4 and 5.) This tappet-wheel has a series of radially-projecting lugs, each of which has ashort side c and a long side o, arranged parallel to each other, the outer edges of which sides of each lug are connected by acurved cam-surfacef, the curve being eccentric to theaXis of rotation. Between the short side of one lug and the long side of the next is formed a rentrant angle c,

which is designed to be filled with some solid lubricant of the consistency of tallow, as shown. The cross-bar 7C of the vibrating frame of the screen is so adjusted that its upper corner on the back stroke enters the angle c between the radial lugs and contacts with and receives a smallquantity of the solid lubricant at each impulse, so that the curved `cannot be obtained from a wiper-cam when worn, as its throw becomes constantly diminished by wear. With my tappet-wheel also the curved cam-surfaces f wear evenly from heel to point in parallel lines to the original contour, as seen by the dotted lines m, as the entire surface of the curve f bears equally.

In constructing the side rails 7ot' the screen they. are extended past the cross-bar 7c and are covered and reinforced by metal end caps g where they strike against thel bumper-blocks 20. This saves the side rails from being battered and forms a strong and l.durable construction.

A and B are discharge-hoppers placed beneath the stationary frame and having spouts which extend the one to one side andthe other to the other side of the screen, as seen in Fig. 3. One of these hoppers, A, receives the material that sifts through the screen and is caught upon the bottom 22 and passes out at 21, and the other hopper, B, is placed beneath a throat t, that receives the material from the upper side of .the screen which is too large to pass through its mesh'.

The hanger-bar 17, which supports the lower end of the iieXible member 10, is made straight and vertical and is on the opposite side ot' the flexible member from the standard 7 X, which supports the upper end of said flexible member.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

ln a bumping-screen, the combination of a 5 tappet-Wheel having radial lugs, each having one short side and one long side connected at the outer edges by an eccentric curve, said radial lugs forming between them rentrant angles adapted to receive hard lubricant, and a vibrating frame having its angular edge pro- IO jected into the said angle between the lugs substantially as and for the purpose described.

HARRY LEALAND KING. Witnesses:

A. W. BUSH, JOHN O. RUSSELL. 

